Speed up vector removal

src/context/timeout.rs

@@ -68,7 +68,7 @@ pub fn trigger(token: &mut CleanLockToken) {
             };
 
             if trigger {
-                registry.remove(i).unwrap()
+                registry.swap_remove_back(i).unwrap()
             } else {
                 i += 1;
                 continue;

src/sync/wait_condition.rs

@@ -111,7 +111,7 @@ impl WaitCondition {
                 .iter()
                 .position(|c| Weak::as_ptr(c) == Arc::as_ptr(&current_context_ref))
             {
-                contexts.remove(index);
+                contexts.swap_remove(index);
                 waited = false;
             }
         }